Third-Party Tools

import requests
import json
from datetime import datetime, timedelta

class TrackersListClient:
    def __init__(self, cache_file='trackers_cache.json'):
        self.cache_file = cache_file
        self.mirrors = [
            'https://cdn.jsdelivr.net/gh/ngosang/trackerslist@master/trackers_best.txt',
            'https://ngosang.github.io/trackerslist/trackers_best.txt',
            'https://raw.githubusercontent.com/ngosang/trackerslist/master/trackers_best.txt'
        ]
    
    def get_trackers(self, list_name='trackers_best', force_refresh=False):
        # Check cache
        if not force_refresh:
            cached = self._load_cache()
            if cached:
                return cached
        
        # Fetch from mirrors with failover
        for mirror in self.mirrors:
            try:
                url = mirror.replace('trackers_best.txt', f'{list_name}.txt')
                response = requests.get(url, timeout=10)
                response.raise_for_status()
                
                trackers = [line.strip() for line in response.text.split('\n') if line.strip()]
                self._save_cache(trackers)
                return trackers
            except requests.RequestException:
                continue
        
        raise Exception('All mirrors failed')
    
    def _load_cache(self):
        try:
            with open(self.cache_file, 'r') as f:
                data = json.load(f)
                timestamp = datetime.fromisoformat(data['timestamp'])
                if datetime.now() - timestamp < timedelta(hours=24):
                    return data['trackers']
        except (FileNotFoundError, KeyError, ValueError):
            pass
        return None
    
    def _save_cache(self, trackers):
        with open(self.cache_file, 'w') as f:
            json.dump({
                'timestamp': datetime.now().isoformat(),
                'trackers': trackers
            }, f)

# Usage
client = TrackersListClient()
trackers = client.get_trackers()
print(f'Fetched {len(trackers)} trackers')